... cDepartment of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, University of Iowa, Ames, Iowa USA,dDepartment of Avian Medicine, College of Veterinary Medicine, ... available for swine displaying clinical signs of infection with PRV. Currently, healthy animals are routinelyimmunized with inactivated (killed) or modified live virus(including those that are ... changes in the number and pattern of DNA fragments of virusesreisolated from tissues in comparison to PRV in theinoculum (i.e., PRV MS+1), strongly indicating that all theviral genomes were retained...